You don't only "breath in air, and breath out air,"
You breath in Oxygen and let out Carbon Dioxide. Passes to the diaphragm and the lungs, inhale oxygen, it goes through your body, exhale Carbon Dioxide, From which the body has made when inhaled.
When you breathe in, your diaphragm contracts (tightens) and moves downward. This increases the space in your chest cavity, into which your lungs expand. The intercostal muscles between your ribs also help enlarge the chest cavity. They contract to pull your rib cage both upward and outward when you inhale.
As your lungs expand, air is sucked in through your nose or mouth. The air travels down your windpipe and into your lungs. After passing through your bronchial tubes, the air finally reaches and enters the alveoli (air sacs).
Through very thin walls of the alveoli, oxygen from the air passes to the surrounding capillaries (blood vessels). A red blood cell protein called hemoglobin (HEE-muh-glow-bin) helps move oxygen from the air sacs to the blood. (Oxygen is especially drawn to hemoglobin.)
At the same time, carbon dioxide moves from the capillaries into the air sacs. The gas has traveled in the bloodstream from the right side of the heart through the pulmonary artery.
Oxygen-rich blood from the lungs is carried through a network of capillaries, which become the pulmonary vein. This vein delivers the oxygen-rich blood to the left side of the heart. The left side of the heart pumps the blood to the rest of the body. There, the oxygen in the blood moves from blood vessels into surrounding tissues.
(For more information on blood flow, see the Diseases and Conditions Index "How the Heart Works" article.)
Breathing Out (Exhalation)When you breathe out, your diaphragm relaxes and moves upward into the chest cavity. The intercostal muscles between the ribs also relax to make the chest cavity size smaller.
As the chest cavity gets smaller, air rich in carbon dioxide is forced out of your lungs and windpipe, and then out of your nose or mouth.
Breathing out requires no effort from your body unless you have a lung disease or are doing physical activity. When you're physically active, your abdominal muscles contract and push your diaphragm even more so against your lungs. This pushes the air in your lungs out rapidly.
.
When breathing in, or inhaling, the diaphragm contracts, or tightens. When exhaling, or breathing out, the diaphragm expands, or loosens.
it will increase
Pressure within the thorax decreases and air is drawn into the lungs
both you can start with breathing out or by breathing in
respiration happens inside the body and breathing happens outside the body
Your breathing becomes deeper and faster.
you first breath in and then you breath out
Yes, breathing heavy is the body trying to recover more oxygen. It happens during exercise such as running as your body tries to recover the lost oxygen.
Increases due to greater oxygen demands and a rising blood CO2 concentration (PCO2).
Breathing speeds up, but the breaths are shallower.
normal breathing is nice and easy while breathing during an asthma attack is difficult and doesnt allow you to fully use your airways.
Sympathetic activation almost always speeds up any system. In this case breathing rate.